MURRYSVILLE, Pa. (AP) — An official says four students were believed to be seriously injured at a high school near Pittsburgh, where a student with a knife stabbed or slashed others, injuring as many as 20.

Westmoreland County emergency management spokesman Dan Stevens says not all of the 20 injured were cut by the knife, though most were. Some suffered scrapes and cuts in the mayhem that ensued at Franklin Regional High School in Murrysville on Wednesday morning.

Stevens says it doesn’t appear any students suffered life-threatening injuries. He says all the injured are between 14 and 17 years old.

The suspect, a male student, was taken into custody and being questioned.

Stevens says the suspect used a knife, though he didn’t say what kind or why he attacked the others.